//
// Copyright (c) 2011 Five-technology Co.,Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#import "FBEncryptorAES.h"

@implementation FBEncryptorAES


+ (NSData*)encryptData:(NSData*)data key:(NSData*)key;
{
    NSData* result = nil;

    // setup key
    unsigned char cKey[FBENCRYPT_KEY_SIZE];
	bzero(cKey, sizeof(cKey));
    [key getBytes:cKey length:FBENCRYPT_KEY_SIZE];

    // setup output buffer
	size_t bufferSize = [data length] + FBENCRYPT_BLOCK_SIZE;
	void *buffer = malloc(bufferSize);

    // do encrypt
	size_t encryptedSize = 0;
	CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
                                          FBENCRYPT_ALGORITHM,
                                          kCCOptionECBMode|kCCOptionPKCS7Padding,
                                          cKey,
                                          FBENCRYPT_KEY_SIZE,
                                          nil,
                                          [data bytes],
                                          [data length],
                                          buffer,
                                          bufferSize,
										  &encryptedSize);
	if (cryptStatus == kCCSuccess) {
		result = [NSData dataWithBytesNoCopy:buffer length:encryptedSize];
	} else {
        free(buffer);
        NSLog(@"[ERROR] failed to encrypt|CCCryptoStatus: %d", cryptStatus);
    }
	
	return result;
}

+ (NSData*)decryptData:(NSData*)data key:(NSData*)key;
{
    NSData* result = nil;

    // setup key
    unsigned char cKey[FBENCRYPT_KEY_SIZE];
	bzero(cKey, sizeof(cKey));
    [key getBytes:cKey length:FBENCRYPT_KEY_SIZE];

    // setup output buffer
	size_t bufferSize = [data length] + FBENCRYPT_BLOCK_SIZE;
	void *buffer = malloc(bufferSize);
	
    // do decrypt
	size_t decryptedSize = 0;
	CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,
                                          FBENCRYPT_ALGORITHM,
                                          kCCOptionECBMode|kCCOptionPKCS7Padding,
										  cKey,
                                          FBENCRYPT_KEY_SIZE,
                                          nil,
                                          [data bytes],
                                          [data length],
                                          buffer,
                                          bufferSize,
                                          &decryptedSize);
	
	if (cryptStatus == kCCSuccess) {
		result = [NSData dataWithBytesNoCopy:buffer length:decryptedSize];
	} else {
        free(buffer);
        NSLog(@"[ERROR] failed to decrypt| CCCryptoStatus: %d", cryptStatus);
    }

	return result;  
}

@end
